1. Better UIThis may include reborn (faster) symbol coloring. Add to this different fonts for different types of symbols (take source insight as an example of what I mean). And finally a background image and background transparency (background videos will be too much though).

2. Better embedded scripts support (someone already mentioned this).

3. Support for RoR and Django template languages.

4. 3 way diff.

5. Performance improvements (This is not a new feature, but I'd still love to see this, especially in tagging).